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sigfox MODBUS MASTER - Guide utilisateur / User guide version V1.0.1
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5.3. 2-wire RS485 example of wiring
MODBUS SLAVE
RS-485 2 wires
C (GND)
B (TX)
V+
A (RX)
GND
Associated configuration:
• Register 321 : bit 0 = 0 (RS485)
• Switch :
• Int 1 = ON (RS-485 bus end-of-line resistor)
•
Int 2 and 3 = ON
(RS-485 bus polarization)
5.4. RS232 example of wiring
MODBUS SLAVE
RS-232
GND
TX
V+
RX
GND
Associated configuration:
• Register 321 : bit 0 =
1 (RS232)
•
Switch :
•
Int 1 = OFF
(RS-485 bus end-of-line resistor)
• Int 2 et 3 = OFF (RS-485 bus polarization)